dc.contributor.author Chen, Xuhui dc.contributor.author Böttcher, Markus dc.contributor.author Pohl, Martin dc.contributor.author Gao, Shan dc.date.accessioned 2017-04-12T09:13:57Z dc.date.available 2017-04-12T09:13:57Z dc.date.issued 2016 dc.identifier.citation Chen, X. et al. 2016. Particle diffusion and localized acceleration in inhomogeneous AGN jets. II. Stochastic variation. Monthly notices of the Royal Astronomical Society, 458(3):3260-3271. [https://academic.oup.com/mnras] en_US dc.identifier.issn 0035-8711 dc.identifier.issn 1365-2966 (Online) dc.identifier.uri http://hdl.handle.net/10394/21354 dc.identifier.uri https://doi.org/10.1093/mnras/stw528 dc.identifier.uri https://academic.oup.com/mnras/article/458/3/3260/2589353/Particle-diffusion-and-localized-acceleration-in dc.description.abstract We study the stochastic variation of blazar emission under a 2D spatially resolved leptonic jet model we previously developed. Random events of particle acceleration and injection in small zones within the emission region are assumed to be responsible for flux variations. In addition to producing spectral energy distributions that describe the observed flux of Mrk 421, we further analyse the timing properties of the simulated light curves, such as the power spectral density (PSD) at different bands, flux–flux correlations, as well as the cross-correlation function between X-rays and TeV γ-rays. We find spectral breaks in the PSD at a time-scale comparable to the dominant characteristic time-scale in the system, which is usually the pre-defined decay time-scale of an acceleration event. Cooling imposes a delay, and so PSDs taken at lower energy bands in each emission component (synchrotron or inverse Compton) generally break at longer time-scales. The flux–flux correlation between X-rays and TeV γ-rays can be either quadratic or linear, depending on whether or not there are large variation of the injection into the particle acceleration process. When the relationship is quadratic, the TeV flares lag the X-ray flares, and the optical and GeV flares are large enough to be comparable to the ones in X-ray. When the relationship is linear, the lags are insignificant, and the optical and GeV flares are small en_US dc.language.iso en en_US dc.publisher Oxford Univ Press en_US dc.subject Acceleration of particles en_US dc.subject Diffusion en_US dc.subject Radiation mechanisms: non-thermal en_US dc.subject Galaxies: active en_US dc.subject BL Lacertae objects: individual: Mrk 421 en_US dc.subject Galaxies: jets en_US dc.title Particle diffusion and localized acceleration in inhomogeneous AGN jets. II. Stochastic variation en_US dc.type Article en_US dc.contributor.researchID 24420530 - Böttcher, Markus
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